[OpenLayers-Users] Can I constrain a map to a certain scale in
nick at hogweed.org
Thu Jan 25 16:31:17 EST 2007
On Wednesday 24 Jan 2007 23:47, you wrote:
> On Wed, Jan 24, 2007 at 11:19:25PM +0000, Nick Whitelegg wrote:
> > I'm developing a "slippy map" based on OpenStreetMap with SRTM contours.
> > I have pre-generated a set of 500x500 tiles of scale 100 pixels/km using
> > Mapnik. My maps are in OSGB projection: the bounding box requests are in
> > metre units.
> > With OpenLayers am I able to constrain the map to a certain number of
> > pixels/km e.g. either 100 or 200 (they are the scales I intend to
> > support)?
> Sure. Turn that into map units per pixel (100/1000 -> .1, iiuc), and
> then send a 'resolutions' param in the map options. More info at
OK thanks - that worked :-)
Surprisingly the resolution required was 10, which is neither pixels/km (100)
or pixels/m (.1).
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